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You're fishing, and your finger gets stuck on a fishhook. What do you hope happens next? What do you direct your body to do? You wouldn't want your nervous system to respond by causing you to lift your foot. It is your finger that must be disengaged. But how does your brain get the message that your finger is stuck? How do the muscles in your arm and hand get the message to disconnect that finger from the fishhook? The answer: the electrical part of your body's communication system, the nervous system, goes to work.
Think of the body's nervous system as a vast network of electrical circuits. These circuits relay messages to and from the brain to and from all parts of the body. The nervous system is divided into two parts which perform different functions—the central nervous system and the peripheral nervous system. The brain, the body's command post for this elaborate network, and the spinal cord, the main cable from the brain to the rest of the body, together make up the central nervous system.
The peripheral nervous system is another network of circuits that connects the central nervous system with muscles, glands, and other bodily parts. Together, these two systems make up the complex power network that transmits messages throughout the body. The basic building block of this communications system is the single tiny nerve cell.
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